Debts that can't be paid, won't be paid.
Cory Doctorow is brilliant here, talking about how debt eats up a society until it's paying more in interest than it earns and so collapses, or alternatively how inequality in a society grows until it costs more to guard the wealth than the wealth has, so it collapses.
I don't really have any debt any more but I think regular jubilees would be a good thing. You'd have to pace them randomly so nobody knew when it was coming, but you could have like a 1/50 chance every new-year that all debt it wiped out. Something like that.
Cory is amazing. He writes a blog filled with great ideas and links like this pretty much every day. I can't even get the time to *read* them all, let alone write them. How the hell does he do it?